Sources and original illustrations

Primary references and the limits of this educational collection.

Primary references

• British Council: Past simple — Past simple forms for completed events.
• British Council: Speaking practice — Situational speaking and interactive practice framework.
• British Council: Writing practice — Examples and practice for purposeful written communication.
• British Council: Present perfect — Present perfect form and its relation to the present.
• British Council: Listening practice — Listening activities organized by level and situation.
• BBC Learning English: Pronunciation of ed endings — Regular past endings and final-sound pronunciation distinctions.
• British Council: Conjunctions — Because for reasons and although for contrasting clauses.
• British Council: Relative pronouns and clauses — Identifying relative clauses for people and things.

Original visual material

The diagrams in this edition are original SVG illustrations explaining the sequence or decisions in each guide. They do not show a laboratory experiment, a personal trip or a tested product result. No photographs from the linked sources are reproduced.

Check the source in context

References were consulted during preparation of this edition. A source may cover a broader or narrower question than a particular guide; the support notes above explain why it is listed. Read the original for methodology, exceptions and updates.